The accident at the 161 mile marker — between the Dayton and Frankfort exits — brought southbound traffic to a halt. At 2:05 p.m., state police radio traffic indicated the backup stretched to just south of the Dayton exit.

The tanker is not leaking, according to police broadcasts.

Riley was not aware of any injuries in the crash, and was not able to confirm the type of acid that was in the overturned tanker.

State police recommend motorist avoid the interstate. U.S. 52 is an alternative route around the crash area.